When you're shopping for a swimming pool filter system, there are a few things to keep in mind. The first is the type of filter your pool needs. There are three types of filters: mechanical, chemical, and biological. 

Mechanical filters available at bermuda.co.nz/pools/ use spinning disks or pads to catch particles. They work well if your pool has a small particle count. Chemical filters use acidic or alkaline liquids to remove particles.

They're best if your pool has a high particle count. Biological filters use bacteria to remove particles. They're good for pools with medium to high particle counts. 

There are many factors to consider when choosing a swimming pool filter system, including water chemistry, budget, and space constraints. Here are some tips for selecting the right filtering system for your needs: 

To get an idea of your specific needs, it's important to test the water quality before installing a new filter system. This can be done by using a home testing kit or by consulting with a professional technician.

Once you have an idea of what type of filtering system will work best for your situation, you can start shopping for filters and cartridges. 

Heavier-duty filters will protect larger pools from large particles and other debris while still providing optimum water quality.

On the other hand, medium-duty filters will suit smaller pools that don't require as much protection or finer particle removal. If you have a large pool that receives heavy use or contains high concentrations of chemicals (such as salt), then you'll need to consider purchasing a more powerful filtering system.